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1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * "Ping" sockets
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 *
13 * Based on ipv4/udp.c code.
14 *
15 * Authors: Vasiliy Kulikov / Openwall (for Linux 2.6),
16 * Pavel Kankovsky (for Linux 2.4.32)
17 *
18 * Pavel gave all rights to bugs to Vasiliy,
19 * none of the bugs are Pavel's now.
20 *
21 */
22
23#include <linux/uaccess.h>
24#include <linux/types.h>
25#include <linux/fcntl.h>
26#include <linux/socket.h>
27#include <linux/sockios.h>
28#include <linux/in.h>
29#include <linux/errno.h>
30#include <linux/timer.h>
31#include <linux/mm.h>
32#include <linux/inet.h>
33#include <linux/netdevice.h>
34#include <net/snmp.h>
35#include <net/ip.h>
36#include <net/icmp.h>
37#include <net/protocol.h>
38#include <linux/skbuff.h>
39#include <linux/proc_fs.h>
40#include <linux/export.h>
41#include <net/sock.h>
42#include <net/ping.h>
43#include <net/udp.h>
44#include <net/route.h>
45#include <net/inet_common.h>
46#include <net/checksum.h>
47
48#if IS_ENABLED(CONFIG_IPV6)
49#include <linux/in6.h>
50#include <linux/icmpv6.h>
51#include <net/addrconf.h>
52#include <net/ipv6.h>
53#include <net/transp_v6.h>
54#endif
55
56struct ping_table {
57 struct hlist_nulls_head hash[PING_HTABLE_SIZE];
58 rwlock_t lock;
59};
60
61static struct ping_table ping_table;
62struct pingv6_ops pingv6_ops;
63EXPORT_SYMBOL_GPL(pingv6_ops);
64
65static u16 ping_port_rover;
66
67static inline u32 ping_hashfn(const struct net *net, u32 num, u32 mask)
68{
69 u32 res = (num + net_hash_mix(net)) & mask;
70
71 pr_debug("hash(%u) = %u\n", num, res);
72 return res;
73}
74EXPORT_SYMBOL_GPL(ping_hash);
75
76static inline struct hlist_nulls_head *ping_hashslot(struct ping_table *table,
77 struct net *net, unsigned int num)
78{
79 return &table->hash[ping_hashfn(net, num, PING_HTABLE_MASK)];
80}
81
82int ping_get_port(struct sock *sk, unsigned short ident)
83{
84 struct hlist_nulls_node *node;
85 struct hlist_nulls_head *hlist;
86 struct inet_sock *isk, *isk2;
87 struct sock *sk2 = NULL;
88
89 isk = inet_sk(sk);
90 write_lock_bh(&ping_table.lock);
91 if (ident == 0) {
92 u32 i;
93 u16 result = ping_port_rover + 1;
94
95 for (i = 0; i < (1L << 16); i++, result++) {
96 if (!result)
97 result++; /* avoid zero */
98 hlist = ping_hashslot(&ping_table, sock_net(sk),
99 result);
100 ping_portaddr_for_each_entry(sk2, node, hlist) {
101 isk2 = inet_sk(sk2);
102
103 if (isk2->inet_num == result)
104 goto next_port;
105 }
106
107 /* found */
108 ping_port_rover = ident = result;
109 break;
110next_port:
111 ;
112 }
113 if (i >= (1L << 16))
114 goto fail;
115 } else {
116 hlist = ping_hashslot(&ping_table, sock_net(sk), ident);
117 ping_portaddr_for_each_entry(sk2, node, hlist) {
118 isk2 = inet_sk(sk2);
119
120 /* BUG? Why is this reuse and not reuseaddr? ping.c
121 * doesn't turn off SO_REUSEADDR, and it doesn't expect
122 * that other ping processes can steal its packets.
123 */
124 if ((isk2->inet_num == ident) &&
125 (sk2 != sk) &&
126 (!sk2->sk_reuse || !sk->sk_reuse))
127 goto fail;
128 }
129 }
130
131 pr_debug("found port/ident = %d\n", ident);
132 isk->inet_num = ident;
133 if (sk_unhashed(sk)) {
134 pr_debug("was not hashed\n");
135 sock_hold(sk);
136 hlist_nulls_add_head(&sk->sk_nulls_node, hlist);
137 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
138 }
139 write_unlock_bh(&ping_table.lock);
140 return 0;
141
142fail:
143 write_unlock_bh(&ping_table.lock);
144 return 1;
145}
146EXPORT_SYMBOL_GPL(ping_get_port);
147
148int ping_hash(struct sock *sk)
149{
150 pr_debug("ping_hash(sk->port=%u)\n", inet_sk(sk)->inet_num);
151 BUG(); /* "Please do not press this button again." */
152
153 return 0;
154}
155
156void ping_unhash(struct sock *sk)
157{
158 struct inet_sock *isk = inet_sk(sk);
159
160 pr_debug("ping_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num);
161 write_lock_bh(&ping_table.lock);
162 if (sk_hashed(sk)) {
163 hlist_nulls_del(&sk->sk_nulls_node);
164 sk_nulls_node_init(&sk->sk_nulls_node);
165 sock_put(sk);
166 isk->inet_num = 0;
167 isk->inet_sport = 0;
168 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
169 }
170 write_unlock_bh(&ping_table.lock);
171}
172EXPORT_SYMBOL_GPL(ping_unhash);
173
174static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident)
175{
176 struct hlist_nulls_head *hslot = ping_hashslot(&ping_table, net, ident);
177 struct sock *sk = NULL;
178 struct inet_sock *isk;
179 struct hlist_nulls_node *hnode;
180 int dif = skb->dev->ifindex;
181
182 if (skb->protocol == htons(ETH_P_IP)) {
183 pr_debug("try to find: num = %d, daddr = %pI4, dif = %d\n",
184 (int)ident, &ip_hdr(skb)->daddr, dif);
185#if IS_ENABLED(CONFIG_IPV6)
186 } else if (skb->protocol == htons(ETH_P_IPV6)) {
187 pr_debug("try to find: num = %d, daddr = %pI6c, dif = %d\n",
188 (int)ident, &ipv6_hdr(skb)->daddr, dif);
189#endif
190 }
191
192 read_lock_bh(&ping_table.lock);
193
194 ping_portaddr_for_each_entry(sk, hnode, hslot) {
195 isk = inet_sk(sk);
196
197 pr_debug("iterate\n");
198 if (isk->inet_num != ident)
199 continue;
200
201 if (skb->protocol == htons(ETH_P_IP) &&
202 sk->sk_family == AF_INET) {
203 pr_debug("found: %p: num=%d, daddr=%pI4, dif=%d\n", sk,
204 (int) isk->inet_num, &isk->inet_rcv_saddr,
205 sk->sk_bound_dev_if);
206
207 if (isk->inet_rcv_saddr &&
208 isk->inet_rcv_saddr != ip_hdr(skb)->daddr)
209 continue;
210#if IS_ENABLED(CONFIG_IPV6)
211 } else if (skb->protocol == htons(ETH_P_IPV6) &&
212 sk->sk_family == AF_INET6) {
213
214 pr_debug("found: %p: num=%d, daddr=%pI6c, dif=%d\n", sk,
215 (int) isk->inet_num,
216 &sk->sk_v6_rcv_saddr,
217 sk->sk_bound_dev_if);
218
219 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
220 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr,
221 &ipv6_hdr(skb)->daddr))
222 continue;
223#endif
224 } else {
225 continue;
226 }
227
228 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
229 continue;
230
231 sock_hold(sk);
232 goto exit;
233 }
234
235 sk = NULL;
236exit:
237 read_unlock_bh(&ping_table.lock);
238
239 return sk;
240}
241
242static void inet_get_ping_group_range_net(struct net *net, kgid_t *low,
243 kgid_t *high)
244{
245 kgid_t *data = net->ipv4.ping_group_range.range;
246 unsigned int seq;
247
248 do {
249 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
250
251 *low = data[0];
252 *high = data[1];
253 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
254}
255
256
257int ping_init_sock(struct sock *sk)
258{
259 struct net *net = sock_net(sk);
260 kgid_t group = current_egid();
261 struct group_info *group_info;
262 int i;
263 kgid_t low, high;
264 int ret = 0;
265
266 if (sk->sk_family == AF_INET6)
267 sk->sk_ipv6only = 1;
268
269 inet_get_ping_group_range_net(net, &low, &high);
270 if (gid_lte(low, group) && gid_lte(group, high))
271 return 0;
272
273 group_info = get_current_groups();
274 for (i = 0; i < group_info->ngroups; i++) {
275 kgid_t gid = group_info->gid[i];
276
277 if (gid_lte(low, gid) && gid_lte(gid, high))
278 goto out_release_group;
279 }
280
281 ret = -EACCES;
282
283out_release_group:
284 put_group_info(group_info);
285 return ret;
286}
287EXPORT_SYMBOL_GPL(ping_init_sock);
288
289void ping_close(struct sock *sk, long timeout)
290{
291 pr_debug("ping_close(sk=%p,sk->num=%u)\n",
292 inet_sk(sk), inet_sk(sk)->inet_num);
293 pr_debug("isk->refcnt = %d\n", refcount_read(&sk->sk_refcnt));
294
295 sk_common_release(sk);
296}
297EXPORT_SYMBOL_GPL(ping_close);
298
299/* Checks the bind address and possibly modifies sk->sk_bound_dev_if. */
300static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk,
301 struct sockaddr *uaddr, int addr_len) {
302 struct net *net = sock_net(sk);
303 if (sk->sk_family == AF_INET) {
304 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
305 int chk_addr_ret;
306
307 if (addr_len < sizeof(*addr))
308 return -EINVAL;
309
310 if (addr->sin_family != AF_INET &&
311 !(addr->sin_family == AF_UNSPEC &&
312 addr->sin_addr.s_addr == htonl(INADDR_ANY)))
313 return -EAFNOSUPPORT;
314
315 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n",
316 sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port));
317
318 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
319
320 if (addr->sin_addr.s_addr == htonl(INADDR_ANY))
321 chk_addr_ret = RTN_LOCAL;
322
323 if ((net->ipv4.sysctl_ip_nonlocal_bind == 0 &&
324 isk->freebind == 0 && isk->transparent == 0 &&
325 chk_addr_ret != RTN_LOCAL) ||
326 chk_addr_ret == RTN_MULTICAST ||
327 chk_addr_ret == RTN_BROADCAST)
328 return -EADDRNOTAVAIL;
329
330#if IS_ENABLED(CONFIG_IPV6)
331 } else if (sk->sk_family == AF_INET6) {
332 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
333 int addr_type, scoped, has_addr;
334 struct net_device *dev = NULL;
335
336 if (addr_len < sizeof(*addr))
337 return -EINVAL;
338
339 if (addr->sin6_family != AF_INET6)
340 return -EAFNOSUPPORT;
341
342 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI6c,port=%d)\n",
343 sk, addr->sin6_addr.s6_addr, ntohs(addr->sin6_port));
344
345 addr_type = ipv6_addr_type(&addr->sin6_addr);
346 scoped = __ipv6_addr_needs_scope_id(addr_type);
347 if ((addr_type != IPV6_ADDR_ANY &&
348 !(addr_type & IPV6_ADDR_UNICAST)) ||
349 (scoped && !addr->sin6_scope_id))
350 return -EINVAL;
351
352 rcu_read_lock();
353 if (addr->sin6_scope_id) {
354 dev = dev_get_by_index_rcu(net, addr->sin6_scope_id);
355 if (!dev) {
356 rcu_read_unlock();
357 return -ENODEV;
358 }
359 }
360 has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev,
361 scoped);
362 rcu_read_unlock();
363
364 if (!(net->ipv6.sysctl.ip_nonlocal_bind ||
365 isk->freebind || isk->transparent || has_addr ||
366 addr_type == IPV6_ADDR_ANY))
367 return -EADDRNOTAVAIL;
368
369 if (scoped)
370 sk->sk_bound_dev_if = addr->sin6_scope_id;
371#endif
372 } else {
373 return -EAFNOSUPPORT;
374 }
375 return 0;
376}
377
378static void ping_set_saddr(struct sock *sk, struct sockaddr *saddr)
379{
380 if (saddr->sa_family == AF_INET) {
381 struct inet_sock *isk = inet_sk(sk);
382 struct sockaddr_in *addr = (struct sockaddr_in *) saddr;
383 isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr;
384#if IS_ENABLED(CONFIG_IPV6)
385 } else if (saddr->sa_family == AF_INET6) {
386 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr;
387 struct ipv6_pinfo *np = inet6_sk(sk);
388 sk->sk_v6_rcv_saddr = np->saddr = addr->sin6_addr;
389#endif
390 }
391}
392
393static void ping_clear_saddr(struct sock *sk, int dif)
394{
395 sk->sk_bound_dev_if = dif;
396 if (sk->sk_family == AF_INET) {
397 struct inet_sock *isk = inet_sk(sk);
398 isk->inet_rcv_saddr = isk->inet_saddr = 0;
399#if IS_ENABLED(CONFIG_IPV6)
400 } else if (sk->sk_family == AF_INET6) {
401 struct ipv6_pinfo *np = inet6_sk(sk);
402 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
403 memset(&np->saddr, 0, sizeof(np->saddr));
404#endif
405 }
406}
407/*
408 * We need our own bind because there are no privileged id's == local ports.
409 * Moreover, we don't allow binding to multi- and broadcast addresses.
410 */
411
412int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
413{
414 struct inet_sock *isk = inet_sk(sk);
415 unsigned short snum;
416 int err;
417 int dif = sk->sk_bound_dev_if;
418
419 err = ping_check_bind_addr(sk, isk, uaddr, addr_len);
420 if (err)
421 return err;
422
423 lock_sock(sk);
424
425 err = -EINVAL;
426 if (isk->inet_num != 0)
427 goto out;
428
429 err = -EADDRINUSE;
430 ping_set_saddr(sk, uaddr);
431 snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port);
432 if (ping_get_port(sk, snum) != 0) {
433 ping_clear_saddr(sk, dif);
434 goto out;
435 }
436
437 pr_debug("after bind(): num = %hu, dif = %d\n",
438 isk->inet_num,
439 sk->sk_bound_dev_if);
440
441 err = 0;
442 if (sk->sk_family == AF_INET && isk->inet_rcv_saddr)
443 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
444#if IS_ENABLED(CONFIG_IPV6)
445 if (sk->sk_family == AF_INET6 && !ipv6_addr_any(&sk->sk_v6_rcv_saddr))
446 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
447#endif
448
449 if (snum)
450 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
451 isk->inet_sport = htons(isk->inet_num);
452 isk->inet_daddr = 0;
453 isk->inet_dport = 0;
454
455#if IS_ENABLED(CONFIG_IPV6)
456 if (sk->sk_family == AF_INET6)
457 memset(&sk->sk_v6_daddr, 0, sizeof(sk->sk_v6_daddr));
458#endif
459
460 sk_dst_reset(sk);
461out:
462 release_sock(sk);
463 pr_debug("ping_v4_bind -> %d\n", err);
464 return err;
465}
466EXPORT_SYMBOL_GPL(ping_bind);
467
468/*
469 * Is this a supported type of ICMP message?
470 */
471
472static inline int ping_supported(int family, int type, int code)
473{
474 return (family == AF_INET && type == ICMP_ECHO && code == 0) ||
475 (family == AF_INET6 && type == ICMPV6_ECHO_REQUEST && code == 0);
476}
477
478/*
479 * This routine is called by the ICMP module when it gets some
480 * sort of error condition.
481 */
482
483void ping_err(struct sk_buff *skb, int offset, u32 info)
484{
485 int family;
486 struct icmphdr *icmph;
487 struct inet_sock *inet_sock;
488 int type;
489 int code;
490 struct net *net = dev_net(skb->dev);
491 struct sock *sk;
492 int harderr;
493 int err;
494
495 if (skb->protocol == htons(ETH_P_IP)) {
496 family = AF_INET;
497 type = icmp_hdr(skb)->type;
498 code = icmp_hdr(skb)->code;
499 icmph = (struct icmphdr *)(skb->data + offset);
500 } else if (skb->protocol == htons(ETH_P_IPV6)) {
501 family = AF_INET6;
502 type = icmp6_hdr(skb)->icmp6_type;
503 code = icmp6_hdr(skb)->icmp6_code;
504 icmph = (struct icmphdr *) (skb->data + offset);
505 } else {
506 BUG();
507 }
508
509 /* We assume the packet has already been checked by icmp_unreach */
510
511 if (!ping_supported(family, icmph->type, icmph->code))
512 return;
513
514 pr_debug("ping_err(proto=0x%x,type=%d,code=%d,id=%04x,seq=%04x)\n",
515 skb->protocol, type, code, ntohs(icmph->un.echo.id),
516 ntohs(icmph->un.echo.sequence));
517
518 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
519 if (!sk) {
520 pr_debug("no socket, dropping\n");
521 return; /* No socket for error */
522 }
523 pr_debug("err on socket %p\n", sk);
524
525 err = 0;
526 harderr = 0;
527 inet_sock = inet_sk(sk);
528
529 if (skb->protocol == htons(ETH_P_IP)) {
530 switch (type) {
531 default:
532 case ICMP_TIME_EXCEEDED:
533 err = EHOSTUNREACH;
534 break;
535 case ICMP_SOURCE_QUENCH:
536 /* This is not a real error but ping wants to see it.
537 * Report it with some fake errno.
538 */
539 err = EREMOTEIO;
540 break;
541 case ICMP_PARAMETERPROB:
542 err = EPROTO;
543 harderr = 1;
544 break;
545 case ICMP_DEST_UNREACH:
546 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
547 ipv4_sk_update_pmtu(skb, sk, info);
548 if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) {
549 err = EMSGSIZE;
550 harderr = 1;
551 break;
552 }
553 goto out;
554 }
555 err = EHOSTUNREACH;
556 if (code <= NR_ICMP_UNREACH) {
557 harderr = icmp_err_convert[code].fatal;
558 err = icmp_err_convert[code].errno;
559 }
560 break;
561 case ICMP_REDIRECT:
562 /* See ICMP_SOURCE_QUENCH */
563 ipv4_sk_redirect(skb, sk);
564 err = EREMOTEIO;
565 break;
566 }
567#if IS_ENABLED(CONFIG_IPV6)
568 } else if (skb->protocol == htons(ETH_P_IPV6)) {
569 harderr = pingv6_ops.icmpv6_err_convert(type, code, &err);
570#endif
571 }
572
573 /*
574 * RFC1122: OK. Passes ICMP errors back to application, as per
575 * 4.1.3.3.
576 */
577 if ((family == AF_INET && !inet_sock->recverr) ||
578 (family == AF_INET6 && !inet6_sk(sk)->recverr)) {
579 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
580 goto out;
581 } else {
582 if (family == AF_INET) {
583 ip_icmp_error(sk, skb, err, 0 /* no remote port */,
584 info, (u8 *)icmph);
585#if IS_ENABLED(CONFIG_IPV6)
586 } else if (family == AF_INET6) {
587 pingv6_ops.ipv6_icmp_error(sk, skb, err, 0,
588 info, (u8 *)icmph);
589#endif
590 }
591 }
592 sk->sk_err = err;
593 sk->sk_error_report(sk);
594out:
595 sock_put(sk);
596}
597EXPORT_SYMBOL_GPL(ping_err);
598
599/*
600 * Copy and checksum an ICMP Echo packet from user space into a buffer
601 * starting from the payload.
602 */
603
604int ping_getfrag(void *from, char *to,
605 int offset, int fraglen, int odd, struct sk_buff *skb)
606{
607 struct pingfakehdr *pfh = (struct pingfakehdr *)from;
608
609 if (offset == 0) {
610 fraglen -= sizeof(struct icmphdr);
611 if (fraglen < 0)
612 BUG();
613 if (!csum_and_copy_from_iter_full(to + sizeof(struct icmphdr),
614 fraglen, &pfh->wcheck,
615 &pfh->msg->msg_iter))
616 return -EFAULT;
617 } else if (offset < sizeof(struct icmphdr)) {
618 BUG();
619 } else {
620 if (!csum_and_copy_from_iter_full(to, fraglen, &pfh->wcheck,
621 &pfh->msg->msg_iter))
622 return -EFAULT;
623 }
624
625#if IS_ENABLED(CONFIG_IPV6)
626 /* For IPv6, checksum each skb as we go along, as expected by
627 * icmpv6_push_pending_frames. For IPv4, accumulate the checksum in
628 * wcheck, it will be finalized in ping_v4_push_pending_frames.
629 */
630 if (pfh->family == AF_INET6) {
631 skb->csum = pfh->wcheck;
632 skb->ip_summed = CHECKSUM_NONE;
633 pfh->wcheck = 0;
634 }
635#endif
636
637 return 0;
638}
639EXPORT_SYMBOL_GPL(ping_getfrag);
640
641static int ping_v4_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh,
642 struct flowi4 *fl4)
643{
644 struct sk_buff *skb = skb_peek(&sk->sk_write_queue);
645
646 if (!skb)
647 return 0;
648 pfh->wcheck = csum_partial((char *)&pfh->icmph,
649 sizeof(struct icmphdr), pfh->wcheck);
650 pfh->icmph.checksum = csum_fold(pfh->wcheck);
651 memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr));
652 skb->ip_summed = CHECKSUM_NONE;
653 return ip_push_pending_frames(sk, fl4);
654}
655
656int ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
657 void *user_icmph, size_t icmph_len) {
658 u8 type, code;
659
660 if (len > 0xFFFF)
661 return -EMSGSIZE;
662
663 /* Must have at least a full ICMP header. */
664 if (len < icmph_len)
665 return -EINVAL;
666
667 /*
668 * Check the flags.
669 */
670
671 /* Mirror BSD error message compatibility */
672 if (msg->msg_flags & MSG_OOB)
673 return -EOPNOTSUPP;
674
675 /*
676 * Fetch the ICMP header provided by the userland.
677 * iovec is modified! The ICMP header is consumed.
678 */
679 if (memcpy_from_msg(user_icmph, msg, icmph_len))
680 return -EFAULT;
681
682 if (family == AF_INET) {
683 type = ((struct icmphdr *) user_icmph)->type;
684 code = ((struct icmphdr *) user_icmph)->code;
685#if IS_ENABLED(CONFIG_IPV6)
686 } else if (family == AF_INET6) {
687 type = ((struct icmp6hdr *) user_icmph)->icmp6_type;
688 code = ((struct icmp6hdr *) user_icmph)->icmp6_code;
689#endif
690 } else {
691 BUG();
692 }
693
694 if (!ping_supported(family, type, code))
695 return -EINVAL;
696
697 return 0;
698}
699EXPORT_SYMBOL_GPL(ping_common_sendmsg);
700
701static int ping_v4_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
702{
703 struct net *net = sock_net(sk);
704 struct flowi4 fl4;
705 struct inet_sock *inet = inet_sk(sk);
706 struct ipcm_cookie ipc;
707 struct icmphdr user_icmph;
708 struct pingfakehdr pfh;
709 struct rtable *rt = NULL;
710 struct ip_options_data opt_copy;
711 int free = 0;
712 __be32 saddr, daddr, faddr;
713 u8 tos;
714 int err;
715
716 pr_debug("ping_v4_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
717
718 err = ping_common_sendmsg(AF_INET, msg, len, &user_icmph,
719 sizeof(user_icmph));
720 if (err)
721 return err;
722
723 /*
724 * Get and verify the address.
725 */
726
727 if (msg->msg_name) {
728 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
729 if (msg->msg_namelen < sizeof(*usin))
730 return -EINVAL;
731 if (usin->sin_family != AF_INET)
732 return -EAFNOSUPPORT;
733 daddr = usin->sin_addr.s_addr;
734 /* no remote port */
735 } else {
736 if (sk->sk_state != TCP_ESTABLISHED)
737 return -EDESTADDRREQ;
738 daddr = inet->inet_daddr;
739 /* no remote port */
740 }
741
742 ipc.sockc.tsflags = sk->sk_tsflags;
743 ipc.addr = inet->inet_saddr;
744 ipc.opt = NULL;
745 ipc.oif = sk->sk_bound_dev_if;
746 ipc.tx_flags = 0;
747 ipc.ttl = 0;
748 ipc.tos = -1;
749
750 if (msg->msg_controllen) {
751 err = ip_cmsg_send(sk, msg, &ipc, false);
752 if (unlikely(err)) {
753 kfree(ipc.opt);
754 return err;
755 }
756 if (ipc.opt)
757 free = 1;
758 }
759 if (!ipc.opt) {
760 struct ip_options_rcu *inet_opt;
761
762 rcu_read_lock();
763 inet_opt = rcu_dereference(inet->inet_opt);
764 if (inet_opt) {
765 memcpy(&opt_copy, inet_opt,
766 sizeof(*inet_opt) + inet_opt->opt.optlen);
767 ipc.opt = &opt_copy.opt;
768 }
769 rcu_read_unlock();
770 }
771
772 sock_tx_timestamp(sk, ipc.sockc.tsflags, &ipc.tx_flags);
773
774 saddr = ipc.addr;
775 ipc.addr = faddr = daddr;
776
777 if (ipc.opt && ipc.opt->opt.srr) {
778 if (!daddr) {
779 err = -EINVAL;
780 goto out_free;
781 }
782 faddr = ipc.opt->opt.faddr;
783 }
784 tos = get_rttos(&ipc, inet);
785 if (sock_flag(sk, SOCK_LOCALROUTE) ||
786 (msg->msg_flags & MSG_DONTROUTE) ||
787 (ipc.opt && ipc.opt->opt.is_strictroute)) {
788 tos |= RTO_ONLINK;
789 }
790
791 if (ipv4_is_multicast(daddr)) {
792 if (!ipc.oif)
793 ipc.oif = inet->mc_index;
794 if (!saddr)
795 saddr = inet->mc_addr;
796 } else if (!ipc.oif)
797 ipc.oif = inet->uc_index;
798
799 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
800 RT_SCOPE_UNIVERSE, sk->sk_protocol,
801 inet_sk_flowi_flags(sk), faddr, saddr, 0, 0,
802 sk->sk_uid);
803
804 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
805 rt = ip_route_output_flow(net, &fl4, sk);
806 if (IS_ERR(rt)) {
807 err = PTR_ERR(rt);
808 rt = NULL;
809 if (err == -ENETUNREACH)
810 IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
811 goto out;
812 }
813
814 err = -EACCES;
815 if ((rt->rt_flags & RTCF_BROADCAST) &&
816 !sock_flag(sk, SOCK_BROADCAST))
817 goto out;
818
819 if (msg->msg_flags & MSG_CONFIRM)
820 goto do_confirm;
821back_from_confirm:
822
823 if (!ipc.addr)
824 ipc.addr = fl4.daddr;
825
826 lock_sock(sk);
827
828 pfh.icmph.type = user_icmph.type; /* already checked */
829 pfh.icmph.code = user_icmph.code; /* ditto */
830 pfh.icmph.checksum = 0;
831 pfh.icmph.un.echo.id = inet->inet_sport;
832 pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence;
833 pfh.msg = msg;
834 pfh.wcheck = 0;
835 pfh.family = AF_INET;
836
837 err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len,
838 0, &ipc, &rt, msg->msg_flags);
839 if (err)
840 ip_flush_pending_frames(sk);
841 else
842 err = ping_v4_push_pending_frames(sk, &pfh, &fl4);
843 release_sock(sk);
844
845out:
846 ip_rt_put(rt);
847out_free:
848 if (free)
849 kfree(ipc.opt);
850 if (!err) {
851 icmp_out_count(sock_net(sk), user_icmph.type);
852 return len;
853 }
854 return err;
855
856do_confirm:
857 if (msg->msg_flags & MSG_PROBE)
858 dst_confirm_neigh(&rt->dst, &fl4.daddr);
859 if (!(msg->msg_flags & MSG_PROBE) || len)
860 goto back_from_confirm;
861 err = 0;
862 goto out;
863}
864
865int ping_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock,
866 int flags, int *addr_len)
867{
868 struct inet_sock *isk = inet_sk(sk);
869 int family = sk->sk_family;
870 struct sk_buff *skb;
871 int copied, err;
872
873 pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num);
874
875 err = -EOPNOTSUPP;
876 if (flags & MSG_OOB)
877 goto out;
878
879 if (flags & MSG_ERRQUEUE)
880 return inet_recv_error(sk, msg, len, addr_len);
881
882 skb = skb_recv_datagram(sk, flags, noblock, &err);
883 if (!skb)
884 goto out;
885
886 copied = skb->len;
887 if (copied > len) {
888 msg->msg_flags |= MSG_TRUNC;
889 copied = len;
890 }
891
892 /* Don't bother checking the checksum */
893 err = skb_copy_datagram_msg(skb, 0, msg, copied);
894 if (err)
895 goto done;
896
897 sock_recv_timestamp(msg, sk, skb);
898
899 /* Copy the address and add cmsg data. */
900 if (family == AF_INET) {
901 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
902
903 if (sin) {
904 sin->sin_family = AF_INET;
905 sin->sin_port = 0 /* skb->h.uh->source */;
906 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
907 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
908 *addr_len = sizeof(*sin);
909 }
910
911 if (isk->cmsg_flags)
912 ip_cmsg_recv(msg, skb);
913
914#if IS_ENABLED(CONFIG_IPV6)
915 } else if (family == AF_INET6) {
916 struct ipv6_pinfo *np = inet6_sk(sk);
917 struct ipv6hdr *ip6 = ipv6_hdr(skb);
918 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
919
920 if (sin6) {
921 sin6->sin6_family = AF_INET6;
922 sin6->sin6_port = 0;
923 sin6->sin6_addr = ip6->saddr;
924 sin6->sin6_flowinfo = 0;
925 if (np->sndflow)
926 sin6->sin6_flowinfo = ip6_flowinfo(ip6);
927 sin6->sin6_scope_id =
928 ipv6_iface_scope_id(&sin6->sin6_addr,
929 inet6_iif(skb));
930 *addr_len = sizeof(*sin6);
931 }
932
933 if (inet6_sk(sk)->rxopt.all)
934 pingv6_ops.ip6_datagram_recv_common_ctl(sk, msg, skb);
935 if (skb->protocol == htons(ETH_P_IPV6) &&
936 inet6_sk(sk)->rxopt.all)
937 pingv6_ops.ip6_datagram_recv_specific_ctl(sk, msg, skb);
938 else if (skb->protocol == htons(ETH_P_IP) && isk->cmsg_flags)
939 ip_cmsg_recv(msg, skb);
940#endif
941 } else {
942 BUG();
943 }
944
945 err = copied;
946
947done:
948 skb_free_datagram(sk, skb);
949out:
950 pr_debug("ping_recvmsg -> %d\n", err);
951 return err;
952}
953EXPORT_SYMBOL_GPL(ping_recvmsg);
954
955int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
956{
957 pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n",
958 inet_sk(sk), inet_sk(sk)->inet_num, skb);
959 if (sock_queue_rcv_skb(sk, skb) < 0) {
960 kfree_skb(skb);
961 pr_debug("ping_queue_rcv_skb -> failed\n");
962 return -1;
963 }
964 return 0;
965}
966EXPORT_SYMBOL_GPL(ping_queue_rcv_skb);
967
968
969/*
970 * All we need to do is get the socket.
971 */
972
973bool ping_rcv(struct sk_buff *skb)
974{
975 struct sock *sk;
976 struct net *net = dev_net(skb->dev);
977 struct icmphdr *icmph = icmp_hdr(skb);
978
979 /* We assume the packet has already been checked by icmp_rcv */
980
981 pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n",
982 skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
983
984 /* Push ICMP header back */
985 skb_push(skb, skb->data - (u8 *)icmph);
986
987 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
988 if (sk) {
989 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
990
991 pr_debug("rcv on socket %p\n", sk);
992 if (skb2)
993 ping_queue_rcv_skb(sk, skb2);
994 sock_put(sk);
995 return true;
996 }
997 pr_debug("no socket, dropping\n");
998
999 return false;
1000}
1001EXPORT_SYMBOL_GPL(ping_rcv);
1002
1003struct proto ping_prot = {
1004 .name = "PING",
1005 .owner = THIS_MODULE,
1006 .init = ping_init_sock,
1007 .close = ping_close,
1008 .connect = ip4_datagram_connect,
1009 .disconnect = __udp_disconnect,
1010 .setsockopt = ip_setsockopt,
1011 .getsockopt = ip_getsockopt,
1012 .sendmsg = ping_v4_sendmsg,
1013 .recvmsg = ping_recvmsg,
1014 .bind = ping_bind,
1015 .backlog_rcv = ping_queue_rcv_skb,
1016 .release_cb = ip4_datagram_release_cb,
1017 .hash = ping_hash,
1018 .unhash = ping_unhash,
1019 .get_port = ping_get_port,
1020 .obj_size = sizeof(struct inet_sock),
1021};
1022EXPORT_SYMBOL(ping_prot);
1023
1024#ifdef CONFIG_PROC_FS
1025
1026static struct sock *ping_get_first(struct seq_file *seq, int start)
1027{
1028 struct sock *sk;
1029 struct ping_iter_state *state = seq->private;
1030 struct net *net = seq_file_net(seq);
1031
1032 for (state->bucket = start; state->bucket < PING_HTABLE_SIZE;
1033 ++state->bucket) {
1034 struct hlist_nulls_node *node;
1035 struct hlist_nulls_head *hslot;
1036
1037 hslot = &ping_table.hash[state->bucket];
1038
1039 if (hlist_nulls_empty(hslot))
1040 continue;
1041
1042 sk_nulls_for_each(sk, node, hslot) {
1043 if (net_eq(sock_net(sk), net) &&
1044 sk->sk_family == state->family)
1045 goto found;
1046 }
1047 }
1048 sk = NULL;
1049found:
1050 return sk;
1051}
1052
1053static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk)
1054{
1055 struct ping_iter_state *state = seq->private;
1056 struct net *net = seq_file_net(seq);
1057
1058 do {
1059 sk = sk_nulls_next(sk);
1060 } while (sk && (!net_eq(sock_net(sk), net)));
1061
1062 if (!sk)
1063 return ping_get_first(seq, state->bucket + 1);
1064 return sk;
1065}
1066
1067static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos)
1068{
1069 struct sock *sk = ping_get_first(seq, 0);
1070
1071 if (sk)
1072 while (pos && (sk = ping_get_next(seq, sk)) != NULL)
1073 --pos;
1074 return pos ? NULL : sk;
1075}
1076
1077void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family)
1078 __acquires(ping_table.lock)
1079{
1080 struct ping_iter_state *state = seq->private;
1081 state->bucket = 0;
1082 state->family = family;
1083
1084 read_lock_bh(&ping_table.lock);
1085
1086 return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
1087}
1088EXPORT_SYMBOL_GPL(ping_seq_start);
1089
1090static void *ping_v4_seq_start(struct seq_file *seq, loff_t *pos)
1091{
1092 return ping_seq_start(seq, pos, AF_INET);
1093}
1094
1095void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1096{
1097 struct sock *sk;
1098
1099 if (v == SEQ_START_TOKEN)
1100 sk = ping_get_idx(seq, 0);
1101 else
1102 sk = ping_get_next(seq, v);
1103
1104 ++*pos;
1105 return sk;
1106}
1107EXPORT_SYMBOL_GPL(ping_seq_next);
1108
1109void ping_seq_stop(struct seq_file *seq, void *v)
1110 __releases(ping_table.lock)
1111{
1112 read_unlock_bh(&ping_table.lock);
1113}
1114EXPORT_SYMBOL_GPL(ping_seq_stop);
1115
1116static void ping_v4_format_sock(struct sock *sp, struct seq_file *f,
1117 int bucket)
1118{
1119 struct inet_sock *inet = inet_sk(sp);
1120 __be32 dest = inet->inet_daddr;
1121 __be32 src = inet->inet_rcv_saddr;
1122 __u16 destp = ntohs(inet->inet_dport);
1123 __u16 srcp = ntohs(inet->inet_sport);
1124
1125 seq_printf(f, "%5d: %08X:%04X %08X:%04X"
1126 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d",
1127 bucket, src, srcp, dest, destp, sp->sk_state,
1128 sk_wmem_alloc_get(sp),
1129 sk_rmem_alloc_get(sp),
1130 0, 0L, 0,
1131 from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)),
1132 0, sock_i_ino(sp),
1133 refcount_read(&sp->sk_refcnt), sp,
1134 atomic_read(&sp->sk_drops));
1135}
1136
1137static int ping_v4_seq_show(struct seq_file *seq, void *v)
1138{
1139 seq_setwidth(seq, 127);
1140 if (v == SEQ_START_TOKEN)
1141 seq_puts(seq, " sl local_address rem_address st tx_queue "
1142 "rx_queue tr tm->when retrnsmt uid timeout "
1143 "inode ref pointer drops");
1144 else {
1145 struct ping_iter_state *state = seq->private;
1146
1147 ping_v4_format_sock(v, seq, state->bucket);
1148 }
1149 seq_pad(seq, '\n');
1150 return 0;
1151}
1152
1153static int ping_seq_open(struct inode *inode, struct file *file)
1154{
1155 struct ping_seq_afinfo *afinfo = PDE_DATA(inode);
1156 return seq_open_net(inode, file, &afinfo->seq_ops,
1157 sizeof(struct ping_iter_state));
1158}
1159
1160const struct file_operations ping_seq_fops = {
1161 .open = ping_seq_open,
1162 .read = seq_read,
1163 .llseek = seq_lseek,
1164 .release = seq_release_net,
1165};
1166EXPORT_SYMBOL_GPL(ping_seq_fops);
1167
1168static struct ping_seq_afinfo ping_v4_seq_afinfo = {
1169 .name = "icmp",
1170 .family = AF_INET,
1171 .seq_fops = &ping_seq_fops,
1172 .seq_ops = {
1173 .start = ping_v4_seq_start,
1174 .show = ping_v4_seq_show,
1175 .next = ping_seq_next,
1176 .stop = ping_seq_stop,
1177 },
1178};
1179
1180int ping_proc_register(struct net *net, struct ping_seq_afinfo *afinfo)
1181{
1182 struct proc_dir_entry *p;
1183 p = proc_create_data(afinfo->name, 0444, net->proc_net,
1184 afinfo->seq_fops, afinfo);
1185 if (!p)
1186 return -ENOMEM;
1187 return 0;
1188}
1189EXPORT_SYMBOL_GPL(ping_proc_register);
1190
1191void ping_proc_unregister(struct net *net, struct ping_seq_afinfo *afinfo)
1192{
1193 remove_proc_entry(afinfo->name, net->proc_net);
1194}
1195EXPORT_SYMBOL_GPL(ping_proc_unregister);
1196
1197static int __net_init ping_v4_proc_init_net(struct net *net)
1198{
1199 return ping_proc_register(net, &ping_v4_seq_afinfo);
1200}
1201
1202static void __net_exit ping_v4_proc_exit_net(struct net *net)
1203{
1204 ping_proc_unregister(net, &ping_v4_seq_afinfo);
1205}
1206
1207static struct pernet_operations ping_v4_net_ops = {
1208 .init = ping_v4_proc_init_net,
1209 .exit = ping_v4_proc_exit_net,
1210};
1211
1212int __init ping_proc_init(void)
1213{
1214 return register_pernet_subsys(&ping_v4_net_ops);
1215}
1216
1217void ping_proc_exit(void)
1218{
1219 unregister_pernet_subsys(&ping_v4_net_ops);
1220}
1221
1222#endif
1223
1224void __init ping_init(void)
1225{
1226 int i;
1227
1228 for (i = 0; i < PING_HTABLE_SIZE; i++)
1229 INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i);
1230 rwlock_init(&ping_table.lock);
1231}
1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * "Ping" sockets
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 *
13 * Based on ipv4/udp.c code.
14 *
15 * Authors: Vasiliy Kulikov / Openwall (for Linux 2.6),
16 * Pavel Kankovsky (for Linux 2.4.32)
17 *
18 * Pavel gave all rights to bugs to Vasiliy,
19 * none of the bugs are Pavel's now.
20 *
21 */
22
23#include <linux/uaccess.h>
24#include <linux/types.h>
25#include <linux/fcntl.h>
26#include <linux/socket.h>
27#include <linux/sockios.h>
28#include <linux/in.h>
29#include <linux/errno.h>
30#include <linux/timer.h>
31#include <linux/mm.h>
32#include <linux/inet.h>
33#include <linux/netdevice.h>
34#include <net/snmp.h>
35#include <net/ip.h>
36#include <net/icmp.h>
37#include <net/protocol.h>
38#include <linux/skbuff.h>
39#include <linux/proc_fs.h>
40#include <linux/export.h>
41#include <net/sock.h>
42#include <net/ping.h>
43#include <net/udp.h>
44#include <net/route.h>
45#include <net/inet_common.h>
46#include <net/checksum.h>
47
48#if IS_ENABLED(CONFIG_IPV6)
49#include <linux/in6.h>
50#include <linux/icmpv6.h>
51#include <net/addrconf.h>
52#include <net/ipv6.h>
53#include <net/transp_v6.h>
54#endif
55
56struct ping_table {
57 struct hlist_nulls_head hash[PING_HTABLE_SIZE];
58 rwlock_t lock;
59};
60
61static struct ping_table ping_table;
62struct pingv6_ops pingv6_ops;
63EXPORT_SYMBOL_GPL(pingv6_ops);
64
65static u16 ping_port_rover;
66
67static inline int ping_hashfn(struct net *net, unsigned int num, unsigned int mask)
68{
69 int res = (num + net_hash_mix(net)) & mask;
70
71 pr_debug("hash(%d) = %d\n", num, res);
72 return res;
73}
74EXPORT_SYMBOL_GPL(ping_hash);
75
76static inline struct hlist_nulls_head *ping_hashslot(struct ping_table *table,
77 struct net *net, unsigned int num)
78{
79 return &table->hash[ping_hashfn(net, num, PING_HTABLE_MASK)];
80}
81
82int ping_get_port(struct sock *sk, unsigned short ident)
83{
84 struct hlist_nulls_node *node;
85 struct hlist_nulls_head *hlist;
86 struct inet_sock *isk, *isk2;
87 struct sock *sk2 = NULL;
88
89 isk = inet_sk(sk);
90 write_lock_bh(&ping_table.lock);
91 if (ident == 0) {
92 u32 i;
93 u16 result = ping_port_rover + 1;
94
95 for (i = 0; i < (1L << 16); i++, result++) {
96 if (!result)
97 result++; /* avoid zero */
98 hlist = ping_hashslot(&ping_table, sock_net(sk),
99 result);
100 ping_portaddr_for_each_entry(sk2, node, hlist) {
101 isk2 = inet_sk(sk2);
102
103 if (isk2->inet_num == result)
104 goto next_port;
105 }
106
107 /* found */
108 ping_port_rover = ident = result;
109 break;
110next_port:
111 ;
112 }
113 if (i >= (1L << 16))
114 goto fail;
115 } else {
116 hlist = ping_hashslot(&ping_table, sock_net(sk), ident);
117 ping_portaddr_for_each_entry(sk2, node, hlist) {
118 isk2 = inet_sk(sk2);
119
120 /* BUG? Why is this reuse and not reuseaddr? ping.c
121 * doesn't turn off SO_REUSEADDR, and it doesn't expect
122 * that other ping processes can steal its packets.
123 */
124 if ((isk2->inet_num == ident) &&
125 (sk2 != sk) &&
126 (!sk2->sk_reuse || !sk->sk_reuse))
127 goto fail;
128 }
129 }
130
131 pr_debug("found port/ident = %d\n", ident);
132 isk->inet_num = ident;
133 if (sk_unhashed(sk)) {
134 pr_debug("was not hashed\n");
135 sock_hold(sk);
136 hlist_nulls_add_head(&sk->sk_nulls_node, hlist);
137 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
138 }
139 write_unlock_bh(&ping_table.lock);
140 return 0;
141
142fail:
143 write_unlock_bh(&ping_table.lock);
144 return 1;
145}
146EXPORT_SYMBOL_GPL(ping_get_port);
147
148void ping_hash(struct sock *sk)
149{
150 pr_debug("ping_hash(sk->port=%u)\n", inet_sk(sk)->inet_num);
151 BUG(); /* "Please do not press this button again." */
152}
153
154void ping_unhash(struct sock *sk)
155{
156 struct inet_sock *isk = inet_sk(sk);
157 pr_debug("ping_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num);
158 if (sk_hashed(sk)) {
159 write_lock_bh(&ping_table.lock);
160 hlist_nulls_del(&sk->sk_nulls_node);
161 sock_put(sk);
162 isk->inet_num = 0;
163 isk->inet_sport = 0;
164 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
165 write_unlock_bh(&ping_table.lock);
166 }
167}
168EXPORT_SYMBOL_GPL(ping_unhash);
169
170static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident)
171{
172 struct hlist_nulls_head *hslot = ping_hashslot(&ping_table, net, ident);
173 struct sock *sk = NULL;
174 struct inet_sock *isk;
175 struct hlist_nulls_node *hnode;
176 int dif = skb->dev->ifindex;
177
178 if (skb->protocol == htons(ETH_P_IP)) {
179 pr_debug("try to find: num = %d, daddr = %pI4, dif = %d\n",
180 (int)ident, &ip_hdr(skb)->daddr, dif);
181#if IS_ENABLED(CONFIG_IPV6)
182 } else if (skb->protocol == htons(ETH_P_IPV6)) {
183 pr_debug("try to find: num = %d, daddr = %pI6c, dif = %d\n",
184 (int)ident, &ipv6_hdr(skb)->daddr, dif);
185#endif
186 }
187
188 read_lock_bh(&ping_table.lock);
189
190 ping_portaddr_for_each_entry(sk, hnode, hslot) {
191 isk = inet_sk(sk);
192
193 pr_debug("iterate\n");
194 if (isk->inet_num != ident)
195 continue;
196
197 if (skb->protocol == htons(ETH_P_IP) &&
198 sk->sk_family == AF_INET) {
199 pr_debug("found: %p: num=%d, daddr=%pI4, dif=%d\n", sk,
200 (int) isk->inet_num, &isk->inet_rcv_saddr,
201 sk->sk_bound_dev_if);
202
203 if (isk->inet_rcv_saddr &&
204 isk->inet_rcv_saddr != ip_hdr(skb)->daddr)
205 continue;
206#if IS_ENABLED(CONFIG_IPV6)
207 } else if (skb->protocol == htons(ETH_P_IPV6) &&
208 sk->sk_family == AF_INET6) {
209
210 pr_debug("found: %p: num=%d, daddr=%pI6c, dif=%d\n", sk,
211 (int) isk->inet_num,
212 &sk->sk_v6_rcv_saddr,
213 sk->sk_bound_dev_if);
214
215 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
216 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr,
217 &ipv6_hdr(skb)->daddr))
218 continue;
219#endif
220 }
221
222 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
223 continue;
224
225 sock_hold(sk);
226 goto exit;
227 }
228
229 sk = NULL;
230exit:
231 read_unlock_bh(&ping_table.lock);
232
233 return sk;
234}
235
236static void inet_get_ping_group_range_net(struct net *net, kgid_t *low,
237 kgid_t *high)
238{
239 kgid_t *data = net->ipv4.ping_group_range.range;
240 unsigned int seq;
241
242 do {
243 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
244
245 *low = data[0];
246 *high = data[1];
247 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
248}
249
250
251int ping_init_sock(struct sock *sk)
252{
253 struct net *net = sock_net(sk);
254 kgid_t group = current_egid();
255 struct group_info *group_info;
256 int i, j, count;
257 kgid_t low, high;
258 int ret = 0;
259
260 inet_get_ping_group_range_net(net, &low, &high);
261 if (gid_lte(low, group) && gid_lte(group, high))
262 return 0;
263
264 group_info = get_current_groups();
265 count = group_info->ngroups;
266 for (i = 0; i < group_info->nblocks; i++) {
267 int cp_count = min_t(int, NGROUPS_PER_BLOCK, count);
268 for (j = 0; j < cp_count; j++) {
269 kgid_t gid = group_info->blocks[i][j];
270 if (gid_lte(low, gid) && gid_lte(gid, high))
271 goto out_release_group;
272 }
273
274 count -= cp_count;
275 }
276
277 ret = -EACCES;
278
279out_release_group:
280 put_group_info(group_info);
281 return ret;
282}
283EXPORT_SYMBOL_GPL(ping_init_sock);
284
285void ping_close(struct sock *sk, long timeout)
286{
287 pr_debug("ping_close(sk=%p,sk->num=%u)\n",
288 inet_sk(sk), inet_sk(sk)->inet_num);
289 pr_debug("isk->refcnt = %d\n", sk->sk_refcnt.counter);
290
291 sk_common_release(sk);
292}
293EXPORT_SYMBOL_GPL(ping_close);
294
295/* Checks the bind address and possibly modifies sk->sk_bound_dev_if. */
296static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk,
297 struct sockaddr *uaddr, int addr_len) {
298 struct net *net = sock_net(sk);
299 if (sk->sk_family == AF_INET) {
300 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
301 int chk_addr_ret;
302
303 if (addr_len < sizeof(*addr))
304 return -EINVAL;
305
306 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n",
307 sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port));
308
309 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
310
311 if (addr->sin_addr.s_addr == htonl(INADDR_ANY))
312 chk_addr_ret = RTN_LOCAL;
313
314 if ((sysctl_ip_nonlocal_bind == 0 &&
315 isk->freebind == 0 && isk->transparent == 0 &&
316 chk_addr_ret != RTN_LOCAL) ||
317 chk_addr_ret == RTN_MULTICAST ||
318 chk_addr_ret == RTN_BROADCAST)
319 return -EADDRNOTAVAIL;
320
321#if IS_ENABLED(CONFIG_IPV6)
322 } else if (sk->sk_family == AF_INET6) {
323 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
324 int addr_type, scoped, has_addr;
325 struct net_device *dev = NULL;
326
327 if (addr_len < sizeof(*addr))
328 return -EINVAL;
329
330 if (addr->sin6_family != AF_INET6)
331 return -EINVAL;
332
333 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI6c,port=%d)\n",
334 sk, addr->sin6_addr.s6_addr, ntohs(addr->sin6_port));
335
336 addr_type = ipv6_addr_type(&addr->sin6_addr);
337 scoped = __ipv6_addr_needs_scope_id(addr_type);
338 if ((addr_type != IPV6_ADDR_ANY &&
339 !(addr_type & IPV6_ADDR_UNICAST)) ||
340 (scoped && !addr->sin6_scope_id))
341 return -EINVAL;
342
343 rcu_read_lock();
344 if (addr->sin6_scope_id) {
345 dev = dev_get_by_index_rcu(net, addr->sin6_scope_id);
346 if (!dev) {
347 rcu_read_unlock();
348 return -ENODEV;
349 }
350 }
351 has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev,
352 scoped);
353 rcu_read_unlock();
354
355 if (!(isk->freebind || isk->transparent || has_addr ||
356 addr_type == IPV6_ADDR_ANY))
357 return -EADDRNOTAVAIL;
358
359 if (scoped)
360 sk->sk_bound_dev_if = addr->sin6_scope_id;
361#endif
362 } else {
363 return -EAFNOSUPPORT;
364 }
365 return 0;
366}
367
368static void ping_set_saddr(struct sock *sk, struct sockaddr *saddr)
369{
370 if (saddr->sa_family == AF_INET) {
371 struct inet_sock *isk = inet_sk(sk);
372 struct sockaddr_in *addr = (struct sockaddr_in *) saddr;
373 isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr;
374#if IS_ENABLED(CONFIG_IPV6)
375 } else if (saddr->sa_family == AF_INET6) {
376 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr;
377 struct ipv6_pinfo *np = inet6_sk(sk);
378 sk->sk_v6_rcv_saddr = np->saddr = addr->sin6_addr;
379#endif
380 }
381}
382
383static void ping_clear_saddr(struct sock *sk, int dif)
384{
385 sk->sk_bound_dev_if = dif;
386 if (sk->sk_family == AF_INET) {
387 struct inet_sock *isk = inet_sk(sk);
388 isk->inet_rcv_saddr = isk->inet_saddr = 0;
389#if IS_ENABLED(CONFIG_IPV6)
390 } else if (sk->sk_family == AF_INET6) {
391 struct ipv6_pinfo *np = inet6_sk(sk);
392 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
393 memset(&np->saddr, 0, sizeof(np->saddr));
394#endif
395 }
396}
397/*
398 * We need our own bind because there are no privileged id's == local ports.
399 * Moreover, we don't allow binding to multi- and broadcast addresses.
400 */
401
402int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
403{
404 struct inet_sock *isk = inet_sk(sk);
405 unsigned short snum;
406 int err;
407 int dif = sk->sk_bound_dev_if;
408
409 err = ping_check_bind_addr(sk, isk, uaddr, addr_len);
410 if (err)
411 return err;
412
413 lock_sock(sk);
414
415 err = -EINVAL;
416 if (isk->inet_num != 0)
417 goto out;
418
419 err = -EADDRINUSE;
420 ping_set_saddr(sk, uaddr);
421 snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port);
422 if (ping_get_port(sk, snum) != 0) {
423 ping_clear_saddr(sk, dif);
424 goto out;
425 }
426
427 pr_debug("after bind(): num = %d, dif = %d\n",
428 (int)isk->inet_num,
429 (int)sk->sk_bound_dev_if);
430
431 err = 0;
432 if (sk->sk_family == AF_INET && isk->inet_rcv_saddr)
433 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
434#if IS_ENABLED(CONFIG_IPV6)
435 if (sk->sk_family == AF_INET6 && !ipv6_addr_any(&sk->sk_v6_rcv_saddr))
436 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
437#endif
438
439 if (snum)
440 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
441 isk->inet_sport = htons(isk->inet_num);
442 isk->inet_daddr = 0;
443 isk->inet_dport = 0;
444
445#if IS_ENABLED(CONFIG_IPV6)
446 if (sk->sk_family == AF_INET6)
447 memset(&sk->sk_v6_daddr, 0, sizeof(sk->sk_v6_daddr));
448#endif
449
450 sk_dst_reset(sk);
451out:
452 release_sock(sk);
453 pr_debug("ping_v4_bind -> %d\n", err);
454 return err;
455}
456EXPORT_SYMBOL_GPL(ping_bind);
457
458/*
459 * Is this a supported type of ICMP message?
460 */
461
462static inline int ping_supported(int family, int type, int code)
463{
464 return (family == AF_INET && type == ICMP_ECHO && code == 0) ||
465 (family == AF_INET6 && type == ICMPV6_ECHO_REQUEST && code == 0);
466}
467
468/*
469 * This routine is called by the ICMP module when it gets some
470 * sort of error condition.
471 */
472
473void ping_err(struct sk_buff *skb, int offset, u32 info)
474{
475 int family;
476 struct icmphdr *icmph;
477 struct inet_sock *inet_sock;
478 int type;
479 int code;
480 struct net *net = dev_net(skb->dev);
481 struct sock *sk;
482 int harderr;
483 int err;
484
485 if (skb->protocol == htons(ETH_P_IP)) {
486 family = AF_INET;
487 type = icmp_hdr(skb)->type;
488 code = icmp_hdr(skb)->code;
489 icmph = (struct icmphdr *)(skb->data + offset);
490 } else if (skb->protocol == htons(ETH_P_IPV6)) {
491 family = AF_INET6;
492 type = icmp6_hdr(skb)->icmp6_type;
493 code = icmp6_hdr(skb)->icmp6_code;
494 icmph = (struct icmphdr *) (skb->data + offset);
495 } else {
496 BUG();
497 }
498
499 /* We assume the packet has already been checked by icmp_unreach */
500
501 if (!ping_supported(family, icmph->type, icmph->code))
502 return;
503
504 pr_debug("ping_err(proto=0x%x,type=%d,code=%d,id=%04x,seq=%04x)\n",
505 skb->protocol, type, code, ntohs(icmph->un.echo.id),
506 ntohs(icmph->un.echo.sequence));
507
508 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
509 if (sk == NULL) {
510 pr_debug("no socket, dropping\n");
511 return; /* No socket for error */
512 }
513 pr_debug("err on socket %p\n", sk);
514
515 err = 0;
516 harderr = 0;
517 inet_sock = inet_sk(sk);
518
519 if (skb->protocol == htons(ETH_P_IP)) {
520 switch (type) {
521 default:
522 case ICMP_TIME_EXCEEDED:
523 err = EHOSTUNREACH;
524 break;
525 case ICMP_SOURCE_QUENCH:
526 /* This is not a real error but ping wants to see it.
527 * Report it with some fake errno.
528 */
529 err = EREMOTEIO;
530 break;
531 case ICMP_PARAMETERPROB:
532 err = EPROTO;
533 harderr = 1;
534 break;
535 case ICMP_DEST_UNREACH:
536 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
537 ipv4_sk_update_pmtu(skb, sk, info);
538 if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) {
539 err = EMSGSIZE;
540 harderr = 1;
541 break;
542 }
543 goto out;
544 }
545 err = EHOSTUNREACH;
546 if (code <= NR_ICMP_UNREACH) {
547 harderr = icmp_err_convert[code].fatal;
548 err = icmp_err_convert[code].errno;
549 }
550 break;
551 case ICMP_REDIRECT:
552 /* See ICMP_SOURCE_QUENCH */
553 ipv4_sk_redirect(skb, sk);
554 err = EREMOTEIO;
555 break;
556 }
557#if IS_ENABLED(CONFIG_IPV6)
558 } else if (skb->protocol == htons(ETH_P_IPV6)) {
559 harderr = pingv6_ops.icmpv6_err_convert(type, code, &err);
560#endif
561 }
562
563 /*
564 * RFC1122: OK. Passes ICMP errors back to application, as per
565 * 4.1.3.3.
566 */
567 if ((family == AF_INET && !inet_sock->recverr) ||
568 (family == AF_INET6 && !inet6_sk(sk)->recverr)) {
569 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
570 goto out;
571 } else {
572 if (family == AF_INET) {
573 ip_icmp_error(sk, skb, err, 0 /* no remote port */,
574 info, (u8 *)icmph);
575#if IS_ENABLED(CONFIG_IPV6)
576 } else if (family == AF_INET6) {
577 pingv6_ops.ipv6_icmp_error(sk, skb, err, 0,
578 info, (u8 *)icmph);
579#endif
580 }
581 }
582 sk->sk_err = err;
583 sk->sk_error_report(sk);
584out:
585 sock_put(sk);
586}
587EXPORT_SYMBOL_GPL(ping_err);
588
589/*
590 * Copy and checksum an ICMP Echo packet from user space into a buffer
591 * starting from the payload.
592 */
593
594int ping_getfrag(void *from, char *to,
595 int offset, int fraglen, int odd, struct sk_buff *skb)
596{
597 struct pingfakehdr *pfh = (struct pingfakehdr *)from;
598
599 if (offset == 0) {
600 if (fraglen < sizeof(struct icmphdr))
601 BUG();
602 if (csum_partial_copy_fromiovecend(to + sizeof(struct icmphdr),
603 pfh->iov, 0, fraglen - sizeof(struct icmphdr),
604 &pfh->wcheck))
605 return -EFAULT;
606 } else if (offset < sizeof(struct icmphdr)) {
607 BUG();
608 } else {
609 if (csum_partial_copy_fromiovecend
610 (to, pfh->iov, offset - sizeof(struct icmphdr),
611 fraglen, &pfh->wcheck))
612 return -EFAULT;
613 }
614
615#if IS_ENABLED(CONFIG_IPV6)
616 /* For IPv6, checksum each skb as we go along, as expected by
617 * icmpv6_push_pending_frames. For IPv4, accumulate the checksum in
618 * wcheck, it will be finalized in ping_v4_push_pending_frames.
619 */
620 if (pfh->family == AF_INET6) {
621 skb->csum = pfh->wcheck;
622 skb->ip_summed = CHECKSUM_NONE;
623 pfh->wcheck = 0;
624 }
625#endif
626
627 return 0;
628}
629EXPORT_SYMBOL_GPL(ping_getfrag);
630
631static int ping_v4_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh,
632 struct flowi4 *fl4)
633{
634 struct sk_buff *skb = skb_peek(&sk->sk_write_queue);
635
636 pfh->wcheck = csum_partial((char *)&pfh->icmph,
637 sizeof(struct icmphdr), pfh->wcheck);
638 pfh->icmph.checksum = csum_fold(pfh->wcheck);
639 memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr));
640 skb->ip_summed = CHECKSUM_NONE;
641 return ip_push_pending_frames(sk, fl4);
642}
643
644int ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
645 void *user_icmph, size_t icmph_len) {
646 u8 type, code;
647
648 if (len > 0xFFFF)
649 return -EMSGSIZE;
650
651 /*
652 * Check the flags.
653 */
654
655 /* Mirror BSD error message compatibility */
656 if (msg->msg_flags & MSG_OOB)
657 return -EOPNOTSUPP;
658
659 /*
660 * Fetch the ICMP header provided by the userland.
661 * iovec is modified! The ICMP header is consumed.
662 */
663 if (memcpy_fromiovec(user_icmph, msg->msg_iov, icmph_len))
664 return -EFAULT;
665
666 if (family == AF_INET) {
667 type = ((struct icmphdr *) user_icmph)->type;
668 code = ((struct icmphdr *) user_icmph)->code;
669#if IS_ENABLED(CONFIG_IPV6)
670 } else if (family == AF_INET6) {
671 type = ((struct icmp6hdr *) user_icmph)->icmp6_type;
672 code = ((struct icmp6hdr *) user_icmph)->icmp6_code;
673#endif
674 } else {
675 BUG();
676 }
677
678 if (!ping_supported(family, type, code))
679 return -EINVAL;
680
681 return 0;
682}
683EXPORT_SYMBOL_GPL(ping_common_sendmsg);
684
685static int ping_v4_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
686 size_t len)
687{
688 struct net *net = sock_net(sk);
689 struct flowi4 fl4;
690 struct inet_sock *inet = inet_sk(sk);
691 struct ipcm_cookie ipc;
692 struct icmphdr user_icmph;
693 struct pingfakehdr pfh;
694 struct rtable *rt = NULL;
695 struct ip_options_data opt_copy;
696 int free = 0;
697 __be32 saddr, daddr, faddr;
698 u8 tos;
699 int err;
700
701 pr_debug("ping_v4_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
702
703 err = ping_common_sendmsg(AF_INET, msg, len, &user_icmph,
704 sizeof(user_icmph));
705 if (err)
706 return err;
707
708 /*
709 * Get and verify the address.
710 */
711
712 if (msg->msg_name) {
713 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
714 if (msg->msg_namelen < sizeof(*usin))
715 return -EINVAL;
716 if (usin->sin_family != AF_INET)
717 return -EINVAL;
718 daddr = usin->sin_addr.s_addr;
719 /* no remote port */
720 } else {
721 if (sk->sk_state != TCP_ESTABLISHED)
722 return -EDESTADDRREQ;
723 daddr = inet->inet_daddr;
724 /* no remote port */
725 }
726
727 ipc.addr = inet->inet_saddr;
728 ipc.opt = NULL;
729 ipc.oif = sk->sk_bound_dev_if;
730 ipc.tx_flags = 0;
731 ipc.ttl = 0;
732 ipc.tos = -1;
733
734 sock_tx_timestamp(sk, &ipc.tx_flags);
735
736 if (msg->msg_controllen) {
737 err = ip_cmsg_send(sock_net(sk), msg, &ipc, false);
738 if (err)
739 return err;
740 if (ipc.opt)
741 free = 1;
742 }
743 if (!ipc.opt) {
744 struct ip_options_rcu *inet_opt;
745
746 rcu_read_lock();
747 inet_opt = rcu_dereference(inet->inet_opt);
748 if (inet_opt) {
749 memcpy(&opt_copy, inet_opt,
750 sizeof(*inet_opt) + inet_opt->opt.optlen);
751 ipc.opt = &opt_copy.opt;
752 }
753 rcu_read_unlock();
754 }
755
756 saddr = ipc.addr;
757 ipc.addr = faddr = daddr;
758
759 if (ipc.opt && ipc.opt->opt.srr) {
760 if (!daddr)
761 return -EINVAL;
762 faddr = ipc.opt->opt.faddr;
763 }
764 tos = get_rttos(&ipc, inet);
765 if (sock_flag(sk, SOCK_LOCALROUTE) ||
766 (msg->msg_flags & MSG_DONTROUTE) ||
767 (ipc.opt && ipc.opt->opt.is_strictroute)) {
768 tos |= RTO_ONLINK;
769 }
770
771 if (ipv4_is_multicast(daddr)) {
772 if (!ipc.oif)
773 ipc.oif = inet->mc_index;
774 if (!saddr)
775 saddr = inet->mc_addr;
776 } else if (!ipc.oif)
777 ipc.oif = inet->uc_index;
778
779 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
780 RT_SCOPE_UNIVERSE, sk->sk_protocol,
781 inet_sk_flowi_flags(sk), faddr, saddr, 0, 0);
782
783 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
784 rt = ip_route_output_flow(net, &fl4, sk);
785 if (IS_ERR(rt)) {
786 err = PTR_ERR(rt);
787 rt = NULL;
788 if (err == -ENETUNREACH)
789 IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
790 goto out;
791 }
792
793 err = -EACCES;
794 if ((rt->rt_flags & RTCF_BROADCAST) &&
795 !sock_flag(sk, SOCK_BROADCAST))
796 goto out;
797
798 if (msg->msg_flags & MSG_CONFIRM)
799 goto do_confirm;
800back_from_confirm:
801
802 if (!ipc.addr)
803 ipc.addr = fl4.daddr;
804
805 lock_sock(sk);
806
807 pfh.icmph.type = user_icmph.type; /* already checked */
808 pfh.icmph.code = user_icmph.code; /* ditto */
809 pfh.icmph.checksum = 0;
810 pfh.icmph.un.echo.id = inet->inet_sport;
811 pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence;
812 pfh.iov = msg->msg_iov;
813 pfh.wcheck = 0;
814 pfh.family = AF_INET;
815
816 err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len,
817 0, &ipc, &rt, msg->msg_flags);
818 if (err)
819 ip_flush_pending_frames(sk);
820 else
821 err = ping_v4_push_pending_frames(sk, &pfh, &fl4);
822 release_sock(sk);
823
824out:
825 ip_rt_put(rt);
826 if (free)
827 kfree(ipc.opt);
828 if (!err) {
829 icmp_out_count(sock_net(sk), user_icmph.type);
830 return len;
831 }
832 return err;
833
834do_confirm:
835 dst_confirm(&rt->dst);
836 if (!(msg->msg_flags & MSG_PROBE) || len)
837 goto back_from_confirm;
838 err = 0;
839 goto out;
840}
841
842int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
843 size_t len, int noblock, int flags, int *addr_len)
844{
845 struct inet_sock *isk = inet_sk(sk);
846 int family = sk->sk_family;
847 struct sk_buff *skb;
848 int copied, err;
849
850 pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num);
851
852 err = -EOPNOTSUPP;
853 if (flags & MSG_OOB)
854 goto out;
855
856 if (flags & MSG_ERRQUEUE) {
857 if (family == AF_INET) {
858 return ip_recv_error(sk, msg, len, addr_len);
859#if IS_ENABLED(CONFIG_IPV6)
860 } else if (family == AF_INET6) {
861 return pingv6_ops.ipv6_recv_error(sk, msg, len,
862 addr_len);
863#endif
864 }
865 }
866
867 skb = skb_recv_datagram(sk, flags, noblock, &err);
868 if (!skb)
869 goto out;
870
871 copied = skb->len;
872 if (copied > len) {
873 msg->msg_flags |= MSG_TRUNC;
874 copied = len;
875 }
876
877 /* Don't bother checking the checksum */
878 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
879 if (err)
880 goto done;
881
882 sock_recv_timestamp(msg, sk, skb);
883
884 /* Copy the address and add cmsg data. */
885 if (family == AF_INET) {
886 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
887
888 if (sin) {
889 sin->sin_family = AF_INET;
890 sin->sin_port = 0 /* skb->h.uh->source */;
891 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
892 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
893 *addr_len = sizeof(*sin);
894 }
895
896 if (isk->cmsg_flags)
897 ip_cmsg_recv(msg, skb);
898
899#if IS_ENABLED(CONFIG_IPV6)
900 } else if (family == AF_INET6) {
901 struct ipv6_pinfo *np = inet6_sk(sk);
902 struct ipv6hdr *ip6 = ipv6_hdr(skb);
903 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
904
905 if (sin6) {
906 sin6->sin6_family = AF_INET6;
907 sin6->sin6_port = 0;
908 sin6->sin6_addr = ip6->saddr;
909 sin6->sin6_flowinfo = 0;
910 if (np->sndflow)
911 sin6->sin6_flowinfo = ip6_flowinfo(ip6);
912 sin6->sin6_scope_id =
913 ipv6_iface_scope_id(&sin6->sin6_addr,
914 IP6CB(skb)->iif);
915 *addr_len = sizeof(*sin6);
916 }
917
918 if (inet6_sk(sk)->rxopt.all)
919 pingv6_ops.ip6_datagram_recv_common_ctl(sk, msg, skb);
920 if (skb->protocol == htons(ETH_P_IPV6) &&
921 inet6_sk(sk)->rxopt.all)
922 pingv6_ops.ip6_datagram_recv_specific_ctl(sk, msg, skb);
923 else if (skb->protocol == htons(ETH_P_IP) && isk->cmsg_flags)
924 ip_cmsg_recv(msg, skb);
925#endif
926 } else {
927 BUG();
928 }
929
930 err = copied;
931
932done:
933 skb_free_datagram(sk, skb);
934out:
935 pr_debug("ping_recvmsg -> %d\n", err);
936 return err;
937}
938EXPORT_SYMBOL_GPL(ping_recvmsg);
939
940int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
941{
942 pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n",
943 inet_sk(sk), inet_sk(sk)->inet_num, skb);
944 if (sock_queue_rcv_skb(sk, skb) < 0) {
945 kfree_skb(skb);
946 pr_debug("ping_queue_rcv_skb -> failed\n");
947 return -1;
948 }
949 return 0;
950}
951EXPORT_SYMBOL_GPL(ping_queue_rcv_skb);
952
953
954/*
955 * All we need to do is get the socket.
956 */
957
958void ping_rcv(struct sk_buff *skb)
959{
960 struct sock *sk;
961 struct net *net = dev_net(skb->dev);
962 struct icmphdr *icmph = icmp_hdr(skb);
963
964 /* We assume the packet has already been checked by icmp_rcv */
965
966 pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n",
967 skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
968
969 /* Push ICMP header back */
970 skb_push(skb, skb->data - (u8 *)icmph);
971
972 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
973 if (sk != NULL) {
974 pr_debug("rcv on socket %p\n", sk);
975 ping_queue_rcv_skb(sk, skb_get(skb));
976 sock_put(sk);
977 return;
978 }
979 pr_debug("no socket, dropping\n");
980
981 /* We're called from icmp_rcv(). kfree_skb() is done there. */
982}
983EXPORT_SYMBOL_GPL(ping_rcv);
984
985struct proto ping_prot = {
986 .name = "PING",
987 .owner = THIS_MODULE,
988 .init = ping_init_sock,
989 .close = ping_close,
990 .connect = ip4_datagram_connect,
991 .disconnect = udp_disconnect,
992 .setsockopt = ip_setsockopt,
993 .getsockopt = ip_getsockopt,
994 .sendmsg = ping_v4_sendmsg,
995 .recvmsg = ping_recvmsg,
996 .bind = ping_bind,
997 .backlog_rcv = ping_queue_rcv_skb,
998 .release_cb = ip4_datagram_release_cb,
999 .hash = ping_hash,
1000 .unhash = ping_unhash,
1001 .get_port = ping_get_port,
1002 .obj_size = sizeof(struct inet_sock),
1003};
1004EXPORT_SYMBOL(ping_prot);
1005
1006#ifdef CONFIG_PROC_FS
1007
1008static struct sock *ping_get_first(struct seq_file *seq, int start)
1009{
1010 struct sock *sk;
1011 struct ping_iter_state *state = seq->private;
1012 struct net *net = seq_file_net(seq);
1013
1014 for (state->bucket = start; state->bucket < PING_HTABLE_SIZE;
1015 ++state->bucket) {
1016 struct hlist_nulls_node *node;
1017 struct hlist_nulls_head *hslot;
1018
1019 hslot = &ping_table.hash[state->bucket];
1020
1021 if (hlist_nulls_empty(hslot))
1022 continue;
1023
1024 sk_nulls_for_each(sk, node, hslot) {
1025 if (net_eq(sock_net(sk), net) &&
1026 sk->sk_family == state->family)
1027 goto found;
1028 }
1029 }
1030 sk = NULL;
1031found:
1032 return sk;
1033}
1034
1035static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk)
1036{
1037 struct ping_iter_state *state = seq->private;
1038 struct net *net = seq_file_net(seq);
1039
1040 do {
1041 sk = sk_nulls_next(sk);
1042 } while (sk && (!net_eq(sock_net(sk), net)));
1043
1044 if (!sk)
1045 return ping_get_first(seq, state->bucket + 1);
1046 return sk;
1047}
1048
1049static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos)
1050{
1051 struct sock *sk = ping_get_first(seq, 0);
1052
1053 if (sk)
1054 while (pos && (sk = ping_get_next(seq, sk)) != NULL)
1055 --pos;
1056 return pos ? NULL : sk;
1057}
1058
1059void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family)
1060{
1061 struct ping_iter_state *state = seq->private;
1062 state->bucket = 0;
1063 state->family = family;
1064
1065 read_lock_bh(&ping_table.lock);
1066
1067 return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
1068}
1069EXPORT_SYMBOL_GPL(ping_seq_start);
1070
1071static void *ping_v4_seq_start(struct seq_file *seq, loff_t *pos)
1072{
1073 return ping_seq_start(seq, pos, AF_INET);
1074}
1075
1076void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1077{
1078 struct sock *sk;
1079
1080 if (v == SEQ_START_TOKEN)
1081 sk = ping_get_idx(seq, 0);
1082 else
1083 sk = ping_get_next(seq, v);
1084
1085 ++*pos;
1086 return sk;
1087}
1088EXPORT_SYMBOL_GPL(ping_seq_next);
1089
1090void ping_seq_stop(struct seq_file *seq, void *v)
1091{
1092 read_unlock_bh(&ping_table.lock);
1093}
1094EXPORT_SYMBOL_GPL(ping_seq_stop);
1095
1096static void ping_v4_format_sock(struct sock *sp, struct seq_file *f,
1097 int bucket)
1098{
1099 struct inet_sock *inet = inet_sk(sp);
1100 __be32 dest = inet->inet_daddr;
1101 __be32 src = inet->inet_rcv_saddr;
1102 __u16 destp = ntohs(inet->inet_dport);
1103 __u16 srcp = ntohs(inet->inet_sport);
1104
1105 seq_printf(f, "%5d: %08X:%04X %08X:%04X"
1106 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d",
1107 bucket, src, srcp, dest, destp, sp->sk_state,
1108 sk_wmem_alloc_get(sp),
1109 sk_rmem_alloc_get(sp),
1110 0, 0L, 0,
1111 from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)),
1112 0, sock_i_ino(sp),
1113 atomic_read(&sp->sk_refcnt), sp,
1114 atomic_read(&sp->sk_drops));
1115}
1116
1117static int ping_v4_seq_show(struct seq_file *seq, void *v)
1118{
1119 seq_setwidth(seq, 127);
1120 if (v == SEQ_START_TOKEN)
1121 seq_puts(seq, " sl local_address rem_address st tx_queue "
1122 "rx_queue tr tm->when retrnsmt uid timeout "
1123 "inode ref pointer drops");
1124 else {
1125 struct ping_iter_state *state = seq->private;
1126
1127 ping_v4_format_sock(v, seq, state->bucket);
1128 }
1129 seq_pad(seq, '\n');
1130 return 0;
1131}
1132
1133static const struct seq_operations ping_v4_seq_ops = {
1134 .show = ping_v4_seq_show,
1135 .start = ping_v4_seq_start,
1136 .next = ping_seq_next,
1137 .stop = ping_seq_stop,
1138};
1139
1140static int ping_seq_open(struct inode *inode, struct file *file)
1141{
1142 struct ping_seq_afinfo *afinfo = PDE_DATA(inode);
1143 return seq_open_net(inode, file, &afinfo->seq_ops,
1144 sizeof(struct ping_iter_state));
1145}
1146
1147const struct file_operations ping_seq_fops = {
1148 .open = ping_seq_open,
1149 .read = seq_read,
1150 .llseek = seq_lseek,
1151 .release = seq_release_net,
1152};
1153EXPORT_SYMBOL_GPL(ping_seq_fops);
1154
1155static struct ping_seq_afinfo ping_v4_seq_afinfo = {
1156 .name = "icmp",
1157 .family = AF_INET,
1158 .seq_fops = &ping_seq_fops,
1159 .seq_ops = {
1160 .start = ping_v4_seq_start,
1161 .show = ping_v4_seq_show,
1162 .next = ping_seq_next,
1163 .stop = ping_seq_stop,
1164 },
1165};
1166
1167int ping_proc_register(struct net *net, struct ping_seq_afinfo *afinfo)
1168{
1169 struct proc_dir_entry *p;
1170 p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net,
1171 afinfo->seq_fops, afinfo);
1172 if (!p)
1173 return -ENOMEM;
1174 return 0;
1175}
1176EXPORT_SYMBOL_GPL(ping_proc_register);
1177
1178void ping_proc_unregister(struct net *net, struct ping_seq_afinfo *afinfo)
1179{
1180 remove_proc_entry(afinfo->name, net->proc_net);
1181}
1182EXPORT_SYMBOL_GPL(ping_proc_unregister);
1183
1184static int __net_init ping_v4_proc_init_net(struct net *net)
1185{
1186 return ping_proc_register(net, &ping_v4_seq_afinfo);
1187}
1188
1189static void __net_exit ping_v4_proc_exit_net(struct net *net)
1190{
1191 ping_proc_unregister(net, &ping_v4_seq_afinfo);
1192}
1193
1194static struct pernet_operations ping_v4_net_ops = {
1195 .init = ping_v4_proc_init_net,
1196 .exit = ping_v4_proc_exit_net,
1197};
1198
1199int __init ping_proc_init(void)
1200{
1201 return register_pernet_subsys(&ping_v4_net_ops);
1202}
1203
1204void ping_proc_exit(void)
1205{
1206 unregister_pernet_subsys(&ping_v4_net_ops);
1207}
1208
1209#endif
1210
1211void __init ping_init(void)
1212{
1213 int i;
1214
1215 for (i = 0; i < PING_HTABLE_SIZE; i++)
1216 INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i);
1217 rwlock_init(&ping_table.lock);
1218}